From 76cb9c2a39d477a64824a985ade40507e3bbade1 Mon Sep 17 00:00:00 2001
From: Adam Mathes <adam@adammathes.com>
Date: Fri, 13 Feb 2026 21:34:48 -0800
Subject: feat(vanilla): add testing infrastructure and tests (NK-wjnczv)

---
 .../undici/lib/web/websocket/sender.js             | 109 +++++++++++++++++++++
 1 file changed, 109 insertions(+)
 create mode 100644 vanilla/node_modules/undici/lib/web/websocket/sender.js

(limited to 'vanilla/node_modules/undici/lib/web/websocket/sender.js')

diff --git a/vanilla/node_modules/undici/lib/web/websocket/sender.js b/vanilla/node_modules/undici/lib/web/websocket/sender.js
new file mode 100644
index 0000000..c647bf6
--- /dev/null
+++ b/vanilla/node_modules/undici/lib/web/websocket/sender.js
@@ -0,0 +1,109 @@
+'use strict'
+
+const { WebsocketFrameSend } = require('./frame')
+const { opcodes, sendHints } = require('./constants')
+const FixedQueue = require('../../dispatcher/fixed-queue')
+
+/**
+ * @typedef {object} SendQueueNode
+ * @property {Promise<void> | null} promise
+ * @property {((...args: any[]) => any)} callback
+ * @property {Buffer | null} frame
+ */
+
+class SendQueue {
+  /**
+   * @type {FixedQueue}
+   */
+  #queue = new FixedQueue()
+
+  /**
+   * @type {boolean}
+   */
+  #running = false
+
+  /** @type {import('node:net').Socket} */
+  #socket
+
+  constructor (socket) {
+    this.#socket = socket
+  }
+
+  add (item, cb, hint) {
+    if (hint !== sendHints.blob) {
+      if (!this.#running) {
+        // TODO(@tsctx): support fast-path for string on running
+        if (hint === sendHints.text) {
+          // special fast-path for string
+          const { 0: head, 1: body } = WebsocketFrameSend.createFastTextFrame(item)
+          this.#socket.cork()
+          this.#socket.write(head)
+          this.#socket.write(body, cb)
+          this.#socket.uncork()
+        } else {
+          // direct writing
+          this.#socket.write(createFrame(item, hint), cb)
+        }
+      } else {
+        /** @type {SendQueueNode} */
+        const node = {
+          promise: null,
+          callback: cb,
+          frame: createFrame(item, hint)
+        }
+        this.#queue.push(node)
+      }
+      return
+    }
+
+    /** @type {SendQueueNode} */
+    const node = {
+      promise: item.arrayBuffer().then((ab) => {
+        node.promise = null
+        node.frame = createFrame(ab, hint)
+      }),
+      callback: cb,
+      frame: null
+    }
+
+    this.#queue.push(node)
+
+    if (!this.#running) {
+      this.#run()
+    }
+  }
+
+  async #run () {
+    this.#running = true
+    const queue = this.#queue
+    while (!queue.isEmpty()) {
+      const node = queue.shift()
+      // wait pending promise
+      if (node.promise !== null) {
+        await node.promise
+      }
+      // write
+      this.#socket.write(node.frame, node.callback)
+      // cleanup
+      node.callback = node.frame = null
+    }
+    this.#running = false
+  }
+}
+
+function createFrame (data, hint) {
+  return new WebsocketFrameSend(toBuffer(data, hint)).createFrame(hint === sendHints.text ? opcodes.TEXT : opcodes.BINARY)
+}
+
+function toBuffer (data, hint) {
+  switch (hint) {
+    case sendHints.text:
+    case sendHints.typedArray:
+      return new Uint8Array(data.buffer, data.byteOffset, data.byteLength)
+    case sendHints.arrayBuffer:
+    case sendHints.blob:
+      return new Uint8Array(data)
+  }
+}
+
+module.exports = { SendQueue }
-- 
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